Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 241 · 40 questions

Engineer's tip (Rough grips, smooth slides): More friction: rough, dry, grippy. Less friction: smooth, oiled, wet, icy, rolling, powdered. Helpful for grip and braking; a problem when it wears or heats parts. Friction test: bigger force needed → more friction.

1. 1.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) chalk on a gym bar (d) a wheel on ball bearings
2. 2.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to look nice (d) to save rubber
3. 3.True or false: a smooth steel slide gives less friction. (a) True (b) False
4. 4.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
5. 5.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
6. 6.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
7. 7.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
8. 8.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
9. 9.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 3 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
11. 11.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) glass (d) ice
12. 12.🔍 Which is the odd one out? (a) a smooth steel slide (b) a grippy rubber sole (c) oil on a squeaky hinge (d) a wheel on ball bearings
13. 13.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wheel on ball bearings (c) a box pushed on carpet (d) skating on ice
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 1 N, a wooden plank 4 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, ice 2 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
16. 16.True or false: powder on a carrom board gives more friction. (a) True (b) False
17. 17.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) a wet tiled floor (d) a grippy rubber sole
18. 18.🛞 Friction acts … (a) only upwards (b) with the motion (c) against the motion (d) only on ice
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, ice 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
20. 20.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
21. 21.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
22. 22.🔍 Which is the odd one out? (a) a rough doormat (b) skating on ice (c) chalk on a gym bar (d) a grippy rubber sole
23. 23.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) a rough doormat (d) oil on a squeaky hinge
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 8 N, ice 1 N, a glass sheet 3 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
25. 25.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
26. 26.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
27. 27.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
29. 29.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
30. 30.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 8 N, a carpet 9 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, a carpet 9 N, sandpaper 13 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
33. 33.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
34. 34.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a carpet 5 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, ice 1 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 4 N, sandpaper 5 N, ice 1 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
38. 38.🔍 Which is the odd one out? (a) a smooth steel slide (b) a rough doormat (c) a wheel on ball bearings (d) oil on a squeaky hinge
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 8 N, sandpaper 10 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 2 N, a wooden plank 4 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice

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